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Evolution of extracellular enzyme activities during manure composting
1Microbial Genomics and Ecology Group, Environmental Sciences Division, Oak Ridge National Laboratory, TN 37831, USA. tiquias@ornl.gov
Journal of Applied Microbiology
|April 23, 2002
Summary
Enzyme profiles during manure composting reveal distinct microbial activities. Poultry manure composting showed higher enzyme abundance and diversity compared to pig manure, indicating varied decomposition pathways.
Area of Science:
- Environmental Microbiology
- Biochemistry
- Composting Science
Background:
- Composting is a vital process for organic waste management.
- Understanding microbial enzyme activity is key to optimizing composting efficiency.
- Extracellular enzymes play a crucial role in the degradation of complex organic matter.
Purpose of the Study:
- To determine extracellular enzyme profiles during poultry and pig manure composting.
- To correlate enzyme activities with microbial population dynamics.
- To compare enzyme profiles between poultry and pig manure composting.
Main Methods:
- Utilized the API ZYM assay to monitor 19 extracellular enzymes.
- Tracked enzyme activities throughout the composting process.
- Correlated enzyme profiles with microbial group populations.
Main Results:
- Observed an increase in enzyme diversity and abundance during composting.
- Poultry manure exhibited higher enzyme relative abundance and activity than pig manure.
- Identified key enzymes: esterase, valine amino-peptidase, and alpha-galactosidase in poultry manure; N-acetyl-beta-glucosaminidase in pig manure.
Conclusions:
- Composting involves a succession of microbial groups and enzyme activities influenced by temperature and substrate changes.
- The API ZYM test effectively monitors compost substrate fluctuations and maturity.
- Enzyme profiling differentiates compost types and assesses compost maturity.